/**
 * 设置响应头的中间件
 */
module.exports = async (ctx, next) => {
    const contentType = `application/json;charset=utf-8`;
    ctx.set('Content-Type', contentType)
    // ctx.response.body = '{"success":true}';//设置响应体
    //设置响应头，允许跨域
    ctx.set('Access-Control-Allow-Origin','*');
    ctx.set('Access-Control-Allow-Methods','OPTIONS,GET,PUT,POST,DELETE')
    await next()
}